Thermolytically grafted silicon particles with ultrathin carbonaceous coating rich of phenyl moieties as lithium-storage anode material
- Authors
- Xuan Tran M.; Woo J.-Y.; Nguyen T.-A.; Lee S.-W.; Lee J. K.
- Issue Date
- Sep-2020
- Publisher
- Elsevier B.V.
- Keywords
- Bundle-like porous Si; Low temperature thermolytic grafting; Phenyl moieties; Ultrathin carbonaceous film
- Citation
- Chemical Engineering Journal, v.395
- Journal Title
- Chemical Engineering Journal
- Volume
- 395
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/60113
- DOI
- 10.1016/j.cej.2020.125169
- ISSN
- 1385-8947
- Abstract
- The most critical bottleneck of Si anode materials is an inevitable cracking and pulverization of Si nanostructure during electrochemical cycling process, resulting in a significant loss of electrical contact and rapid capacity fading. The low-temperature thermolytic grafting process at 360–400 °C was employed to produce a conformal carbon coating on a bundle-like porous silicon (por-Si) prepared by silver-assisted chemical etching. During the thermolytic grafting process, polystyrene infiltrated in the por-Si was depolymerized into styrenic carbon fragments rich of phenyl moieties. The styrenic carbon fragments were subsequently grafted uniformly on the por-Si surface as an ultrathin carbonaceous film of 5 nm, which was confirmed by transmission electronic microscope, X-ray photoelectron spectroscopy, and energy dispersive X-ray spectroscopy. The polystyrene grafted por-Si (por-Si@PS) was employed as a lithium-storage anode material. After 100 cycles at a current rate of 0.5C, the por-Si@PS anode exhibited an excellent reversible capacity of 1938.82 mAh g−1, when compared to those of por-Si and pristine Si anodes with 1228.57 mAh g−1 and 117.43 mAh g−1. The por-Si@PS exhibited a good recovery capability of 93.1% in the C-rate test. The ultrathin carbonaceous coating rich of phenyl moieties not only prevents the rapid pulverization of nanostructured Si, but also enhances the interfacial properties of por-Si@PS as lithium-storage anode material. Notably, the thermolytically grafted Si-C species rich of phenyl moieties played as a strong adhesive passivation layer against the corrosive electrochemical agents during cycling. © 2020 Elsevier B.V.
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